Remove open collective notice from storybook install

[shilman]

Issue: #1938 #1937

What I did

Remove opencollective message

How to test

# build and link
yarn bootstrap && cd lib/cli && yarn link
# use on a sample project
cd && create-react-app cra && cd cra && getstorybook

Is this testable with jest or storyshots?

Does this need a new example in the kitchen sink apps?

Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[codecov]

Codecov Report

Merging #1940 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1940   +/-   ##
=======================================
  Coverage   21.38%   21.38%           
=======================================
  Files         262      262           
  Lines        5757     5757           
  Branches      688      697    +9     
=======================================
  Hits         1231     1231           
+ Misses       4006     3993   -13     
- Partials      520      533   +13

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
app/react/src/server/utils.js	0% <0%> (-53.58%)	⬇️
addons/storyshots/src/storybook-channel-mock.js	0% <0%> (ø)	⬆️
addons/info/src/components/PropVal.js	41.41% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/left_panel/header.js	29.62% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-start.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/down_panel.js	23.52% <0%> (ø)	⬆️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
lib/codemod/src/transforms/update-addon-info.js	51.16% <0%> (ø)	⬆️
... and 24 more

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[Hypnosphi]

LGTM